I was strolling at lunch looking to find hits at barnes and noble when I found this book by an ex-fbi agent of 20 years, very detailed, stuff in there I never even knew. I mean we are talking about chapters by body parts, like the hands and positions they are in, down to the feet and what it means.
Hands down, the very best on body language is Kevin Hogans DVD program. Its expensive but you need nothing else. The most comprehensive program you will ever see anywhere.